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THE EAR

THE EAR. OUTER EAR. Pinna (Auricle) Ear Canal (External Auditory Meatus ) Ear Wax ( Cerumen ). Pinna. Medical name = Auricle Function To catch sound waves To hold our hearing aids, glasses Earrings . Ear Canal. Medical name = External auditory meatus Function

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THE EAR

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  1. THE EAR

  2. OUTER EAR • Pinna (Auricle) • Ear Canal (External Auditory Meatus) • Ear Wax (Cerumen)

  3. Pinna • Medical name = Auricle • Function • To catch sound waves • To hold our hearing aids, glasses • Earrings

  4. Ear Canal • Medical name = External auditory meatus • Function • To funnel the sound waves down towards our ear drum. • Contains ear wax (cerumen)

  5. Ear Wax • Medical name: Cerumen • Function • It keeps the ear canals moist • If not ears will be itchy and irritated • It protects against infection • Traps bacteria/fungi from getting past the ear canal • It protects against flying bugs and crawling insects • The sticky surface traps the insects and other debris

  6. MIDDLE EAR • Ear Drum (Tympanic Membrane) • Bones (Ossicles) • Hammer (Maleus) • Anvil (Incus) • Stirrup (Stapes) • Oval Window • Eustachian Tube

  7. Eardrum • Medical name = Tympanic Membrane • Function • Captures the sound waves and changes them into vibrations • As thin as a tissue!

  8. Bones • Medical name = Ossicles • Function • To pass the sound vibrations from the eardrum to the oval window • The 3 smallest bones in the body! • Hammer = Maleus • Anvil = Incus • Stirrup = Stapes

  9. Oval Window • Medical name = vestibular window • Function • As the stapes beats against the oval window it opens up and a pressure wave allows liquid in the cochlea to move. • When the liquid in the cochlea moves the hair cells begin to move.

  10. Eustachian Tube • No medical name • Function • To allow air to flow in an out of our ear. • Does not help us to hear • If not functioning properly it will cause a hearing loss!

  11. INNER EAR • Cochlea • Hair cells (Cilia) • Hearing Nerve (Auditory Nerve) • Semi-circular canals

  12. Cochlea • No medical name • Function • The organ of corti is stored in the cochlea. • Hair cells and fluid are also stored in the cochlea • Cochlea – from the Latin word snail

  13. Hair Cells • Medical name = Cilia • Function • To transfer the sound vibrations into nerve impulses

  14. Frog Hair Cell Mouse Hair Cells Can you guess which animal these hair cells belong to? Rat inner ear hair cells and first row of outer hair cells Gerbil Cilia

  15. Hearing/ Auditory Nerve • 8th cranial nerve • Function • Sends the impulses concerned with hearing and balance tothe brain

  16. Semi-circular Canals • No medical name • Function • Helps with balance and feeling of motion

  17. Can you label the ear??? • Ear Quiz! • Click on Ear Quiz on Left Side.

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